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Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Apr. 12, 2013
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Aug. 06, 2015
Feb. 28, 2014
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items]            
Proceeds from Issuance of Senior Long-term Debt $ 490,000          
Underwriting Discount on Senior Notes 2.00%          
Capital Leases Including Purchase Option   $ 20,100        
Capital Lease Obligations, Current   9,894   $ 9,491    
Capital Lease Obligations, Noncurrent   10,187   13,650    
Capital Lease Obligations   19,976   23,100    
Capital Leases, Future Minimum Payments Due   20,815        
Capital Leases, Future Minimum Payments, Interest Included in Payments   839        
Senior Notes [Member]            
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items]            
Debt Instrument, Face Amount $ 500,000          
Pension Contributions       $ 6,500    
Debt Instrument, Unamortized Discount $ 10,000 7,400        
Debt Instrument, Interest Rate, Stated Percentage 6.875%          
Interest Expense, Debt   6,600 $ 5,600      
Interest Costs Capitalized   $ 11,600 $ 12,600      
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   100.00%        
Percentage of Notes Redeemable   35.00%        
Debt Instrument, Redemption Price, Percentage   101.00%        
Notes Payable   $ 480,600        
Revolving Credit Facility [Member]            
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity           $ 100,000
Long-term Line of Credit   0        
Revolving Credit Facility [Member] | Subsequent Event [Member]            
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items]            
Long-term Line of Credit         $ 0  
Revett Mining Company, Inc. [Member]            
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage         6.25%  
Notes Payable         $ 4,100  
Notes Payable, Current   1,800        
Notes Payable, Noncurrent   $ 2,300